There is nothing magic about 28″ water. Famed engine builder Smokey Yunick picked this pressure (about 1 psi) many years ago (probably in the 1960s) as what he thought was reasonable, and it stuck. It is now the industry standard.Read the rest of this entry »

Recently a well known racing head porter asked for some graphics (pictures) for an article on head port design. His article dealt with there is more to a head’s performance potential than just CFM flow numbers.